Novel lithium battery pole piece upward coating type double-sided coating device

Abstract

The invention provides a novel lithium battery pole piece upward coating type double-sided coating device which comprises a discharging roll for providing a pole piece base material, a first passing roller, a second passing roller and a third passing roller which are used for changing the conveying direction, and further comprises a fourth passing roller, and a first pressing roller and a coating steel roller which are used for flattening the pole piece base material, the double-sided coating device has the advantages that the working efficiency is high, double-sided coating can be performed simultaneously, the cost is saved and the like, the lip of the second spraying die head faces upwards, the blank leaving problem is avoided, and slurry is uniformly coated; in addition, the front and the back of the second spraying die head are clamped by composite clamping rollers or clamping wheels, so that the operation stability of the battery pole piece is improved, the surface density of the pole piece is improved, and the peeling strength of a base material and a coating layer is improved; and finally, a siphon valve is adopted to avoid the problem of material leakage of the die head, and the coating quality is improved. Therefore, the method has great economic value and social value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of design of lithium battery pole piece double-sided coating equipment, in particular to a novel lithium battery pole piece overhead coating type double-sided coating device. BACKGROUND

[0002] In battery production and manufacturing, battery pole piece substrate coating is one of the key processes in battery production. The existing coating equipment mostly adopts a folding back type, that is, the battery electrode is first coated on one side, then enters an oven for drying the single side, then enters another coating head for coating the other side, and then folds back into the oven for drying, which is low in coating efficiency and high in production cost. Another type is a double-sided coating machine for lithium battery material disclosed in Chinese patent document CN104014461, which coats the front side of the battery pole piece first, then passes through a guide roller to enter a second overhead coating die head for coating the back side. This type uses the die head lip as the fixed point for supporting the pole piece, but this type of coating die head directly contacts and rubs against the pole piece, which is easy to scratch the pole piece and may scratch the pole piece if there are large particles. At the same time, the die head position will also have wear problems, and the die head will also need to be repaired over time. In addition, since the pole piece is always pressed against the die head lip, it is very difficult to perform interval coating, and the die head cannot be retracted to perform interval coating. Therefore, further improvement is needed. SUMMARY

[0003] The purpose of the present application is to provide a lithium battery pole piece double-sided composite coating device with high work efficiency and capable of simultaneously performing double-sided coating to save cost.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] The novel lithium battery pole piece overhead coating type double-sided coating device provided by the present application comprises a material feeding roll for providing a pole piece substrate, a first over roller, a second over roller and a third over roller for changing the conveying direction, a fourth over roller, a first compression roller and a coating steel roller for flattening the pole piece substrate,

[0006] The first over roller, the second over roller, the third over roller and the first compression roller are located on the front side of the pole piece substrate,

[0007] The coating steel roller is provided with a first spraying die head, and the first spraying die head and the coating steel roller are respectively arranged on the front side and the back side of the pole piece substrate. The first spraying die head is used for spraying the front side of the pole piece substrate.

[0008] Further, the first spraying die head is connected with a first siphon valve, which is used for avoiding the leakage of excess material drops from the lip of the first spraying die head and improving the tailing problem during thinning by closing the slurry and opening the siphon valve at the same time during interval coating or head-tail thinning,

[0009] The first siphon valve is connected with a first material pump, and the first material pump is connected with the slurry storage device.

[0010] Further, a thickness gauge and a fourth passing roller are further included for detecting the thickness of the pole piece substrate sprayed by the first spraying die and changing the conveying direction.

[0011] Further, a first clamping wheel assembly and a composite clamping roller assembly are further included for fixing the pole piece substrate conveyed by the fourth passing roller, so as to facilitate secondary coating.

[0012] Further, a second clamping wheel assembly and a third clamping wheel assembly are further included, and a second spraying die is arranged between the first clamping wheel assembly and the composite clamping roller assembly, and the first clamping wheel assembly, the composite clamping roller assembly and the second clamping wheel assembly and the third clamping wheel assembly are used to jointly fix the pole piece substrate subjected to secondary coating, so as to facilitate uniform spraying.

[0013] Further, the second spraying die is located below the pole piece substrate and is used to spray the back surface of the pole piece substrate, and the lip of the second spraying die faces upward, so that uniform coating can be achieved when the pole piece substrate is vertically downward under the influence of gravity, and no blank area is left.

[0014] Further, the second spraying die is connected with a second siphon valve, the second siphon valve is connected with a second material pump, the second material pump is connected with the slurry, the first clamping wheel assembly 14 and the second clamping wheel assembly are located on the front surface of the pole piece substrate,

[0015] The third clamping wheel assembly and the composite clamping roller assembly are located on the back surface of the pole piece substrate.

[0016] Further, an oven device is further included for drying the pole piece substrate subjected to primary spraying and secondary spraying.

[0017] Further, a fifth passing roller, a second pressing roller, a traction roller and a sixth passing roller are further included for changing the conveying direction of the dried pole piece substrate,

[0018] A material receiving roll is further included for receiving the pole piece substrate subjected to drying and changing the conveying direction.

[0019] Further, the fifth passing roller and the second pressing roller are located on the back surface of the pole piece substrate,

[0020] The traction roller and the sixth passing roller are located on the front surface of the pole piece substrate,

[0021] The second pressing roller and the traction roller abut against each other to flatten the pole piece substrate subjected to drying.

[0022] Compared with the prior art, the present application has the advantages of:

[0023] The novel lithium battery pole piece upside coating type double-sided coating device provided by the present application has the advantages of high working efficiency, cost saving due to simultaneous double-sided coating, etc. The present application greatly improves the coating efficiency by adopting the design of simultaneous coating by the first spraying die and the second spraying die. Moreover, the lip of the second spraying die is upward, so that the blanking problem does not occur even if the pole piece substrate is inclined under the influence of gravity, and the slurry is uniformly coated. In addition, the second spraying die is clamped by composite pinch rollers or pinch wheels, which improves the stability of the battery pole piece operation, improves the surface density of the pole piece, and improves the peeling strength of the substrate and the coating layer. Finally, the siphon valve is adopted to avoid the problem of die material leakage and improve the coating quality. Therefore, the present application has great economic value and social value. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a structural schematic view of the novel lithium battery pole piece upside coating type double-sided coating device of the present application;

[0025] Fig. 2 It is a partial structural schematic view of the novel lithium battery pole piece upside coating type double-sided coating device of the present application;

[0026] Fig. 3 It is another partial structural schematic view of the novel lithium battery pole piece upside coating type double-sided coating device of the present application;

[0027] Fig. 4 It is a working schematic view of the novel lithium battery pole piece upside coating type double-sided coating device of the present application;

[0028] Fig. 5 It is a composite pinch roller assembly structural schematic view of the novel lithium battery pole piece upside coating type double-sided coating device of the present application;

[0029] Fig. 6 It is a combined schematic view of the second pinch wheel assembly and the third pinch wheel assembly of the novel lithium battery pole piece upside coating type double-sided coating device of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As Figs. 1-3The embodiment provides a novel lithium battery pole piece up-coating type double-sided coating device.

[0032] The device comprises a stock roll 2 for providing a pole piece substrate 1, a first over roll 3, a second over roll 4 and a third over roll 5 for changing the conveying direction, a fourth over roll 13, a first compression roll 6 and a coating steel roll 7 for flattening the pole piece substrate 1,

[0033] The first over roll 3, the second over roll 4, the third over roll 5 and the first compression roll 6 are located on the front surface of the pole piece substrate 1,

[0034] The coating steel roll 7 is provided with a first spraying die head 8, and the first spraying die head 8 and the coating steel roll 7 are respectively arranged on the front surface and the back surface of the pole piece substrate 1, and the first spraying die head 8 is used for spraying the front surface of the pole piece substrate 1.

[0035] In the embodiment, the first spraying die head 8 is connected with a first siphon valve 9, which is used for avoiding the leakage of the excess material drops of the first spraying die head lip by closing the slurry and opening the siphon valve during the intermediate coating or the head-tail thinning process, and improving the tailing problem during the thinning process,

[0036] The first siphon valve 9 is connected with a first material pump 10, and the first material pump 10 is connected with a slurry storage device 11.

[0037] The embodiment further comprises a thickness gauge 12 and a fourth over roll 13, which are respectively used for detecting the thickness of the pole piece substrate 1 sprayed by the first spraying die head 8 and changing the conveying direction.

[0038] The embodiment further comprises a first clamping wheel assembly 14 and a composite clamping roll assembly 15, which are used for fixing the pole piece substrate 1 conveyed by the fourth over roll 13, so as to facilitate secondary coating.

[0039] The embodiment further comprises a second clamping wheel assembly 16 and a third clamping wheel assembly 17, and a second spraying die head is arranged between the first clamping wheel assembly 14 and the composite clamping roll assembly 15 and the second clamping wheel assembly 16 and the third clamping wheel assembly 17, and the first clamping wheel assembly 14, the composite clamping roll assembly 15 and the second clamping wheel assembly 16 and the third clamping wheel assembly 17 are used for jointly stabilizing the pole piece substrate 1 subjected to secondary coating, so as to facilitate uniform spraying.

[0040] In the embodiment, the second spraying die head 18 is located below the pole piece substrate 1 and is used for spraying the back surface of the pole piece substrate 1, and the lip of the second spraying die head 18 faces upwards, so that the pole piece substrate 1 can be uniformly coated without white spots in the case that the pole piece substrate 1 is vertically affected by gravity.

[0041] In the embodiment, the second spraying die 18 is connected with a second siphon valve 19, the second siphon valve 19 is connected with a second material pump 191, the second material pump 191 is connected with the slurry storage device 11, the first clamping wheel assembly 14 and the second clamping wheel assembly 16 are located on the front surface of the pole piece base material 1,

[0042] The third clamping wheel assembly 17 and the composite clamping roller assembly 15 are located on the back surface of the pole piece base material 1.

[0043] In the embodiment, the drying device 20 (a plurality of nozzles 201 are arranged in the drying device 20) is further included, which is used for drying the pole piece base material 1 after the first spraying and the second spraying.

[0044] In the embodiment, the fifth passing roller 21, the second pressing roller 22, the traction roller 23 and the sixth passing roller 24 are further included, which are used for changing the conveying direction of the dried pole piece base material 1,

[0045] The material collecting roll 25 is further included, which is used for collecting the pole piece base material 1 after drying and changing the conveying direction.

[0046] In the embodiment, the fifth passing roller 21 and the second pressing roller 22 are located on the back surface of the pole piece base material 1,

[0047] The traction roller 23 and the sixth passing roller 24 are located on the front surface of the pole piece base material 1,

[0048] The second pressing roller 22 and the traction roller 23 abut against each other, and the pole piece base material 1 after drying is flattened.

[0049] As shown in the drawings, Figs. 4-5 The novel lithium battery pole piece upward spraying type double-sided coating device has the advantages of high working efficiency, simultaneous double-sided coating and cost saving, etc. The first spraying die and the second spraying die are used for simultaneous coating in the application, which greatly improves the coating efficiency. In addition, the lip of the second spraying die is upward, so that the pole piece base material will not have the problem of white space even if it is affected by gravity and is inclined, and the slurry is uniformly coated. In addition, the composite clamping roller or the clamping wheel is used in front of and behind the second spraying die, which improves the stability of the battery pole piece operation, improves the surface density of the pole piece, and improves the peeling strength of the base material and the coating layer. Finally, the siphon valve is used to avoid the problem of material leakage of the die, and the coating quality is improved. Therefore, the application has great economic value and social value.

[0050] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A novel overhead double-sided coating apparatus for lithium battery electrodes, comprising a feeding roll for providing electrode substrate and a first, second, and third conveying roll for changing the conveying direction, characterized in that: It also includes a fourth pass roller, a first pressure roller for flattening the electrode substrate, and a coating steel roller. The first guide roller, the second guide roller, the third guide roller, and the first pressure roller are located on the front side of the electrode substrate. The coating steel roller is provided with a first spraying die head. The first spraying die head and the coating steel roller are respectively located on the front and back sides of the electrode substrate. The first spraying die head is used to spray the front side of the electrode substrate.

2. The novel lithium battery electrode sheet top-coating double-sided coating device according to claim 1, characterized in that: The first spraying die is connected to a first siphon valve, which is used to close the slurry and open the siphon valve simultaneously during intermittent coating or head-to-tail thinning processes. This prevents excess material from dripping from the lip of the first spraying die and improves the tailing problem during thinning. The first siphon valve is connected to a first feed pump, and the first feed pump is connected to a slurry storage device.

3. The novel lithium battery electrode sheet top-coating double-sided coating device according to claim 1, characterized in that: It also includes a thickness gauge and a fourth roller, which are used to detect the thickness of the electrode substrate that has been sprayed by the first spraying die and to change the conveying direction, respectively.

4. The novel lithium battery electrode sheet top-coating double-sided coating device according to claim 1, characterized in that: It also includes a first clamping roller assembly and a composite clamping roller assembly, which fix the electrode substrate conveyed by the fourth roller to facilitate secondary coating.

5. A novel lithium battery electrode sheet top-coating double-sided coating device according to any one of claims 1 or 4, characterized in that: It also includes a second clamping roller assembly and a third clamping roller assembly. A second spraying die head is provided between the second clamping roller assembly and the third clamping roller assembly and the first clamping roller assembly and the composite clamping roller assembly. The first clamping roller assembly, the composite clamping roller assembly, the second clamping roller assembly and the third clamping roller assembly are used together to stabilize the electrode substrate that is coated in the second stage, so as to facilitate uniform spraying.

6. A novel lithium battery electrode sheet top-coating double-sided coating device according to any one of claims 5, characterized in that: The second spraying die is located below the electrode substrate and is used to spray the reverse side of the electrode substrate. The lip of the second spraying die faces upward, which can evenly coat the electrode substrate when it is drooping under the influence of gravity, without leaving any blanks.

7. A novel lithium battery electrode sheet top-coating double-sided coating device according to any one of claims 5, characterized in that: The second spraying die head is connected to a second siphon valve, which is connected to a second material pump. The second material pump is connected to the slurry. The first clamping roller assembly 14 and the second clamping roller assembly are located on the front side of the electrode substrate. The third clamping roller assembly and the composite clamping roller assembly are located on the reverse side of the electrode substrate.

8. A novel lithium battery electrode sheet top-coating double-sided coating device according to any one of claims 1, characterized in that: It also includes a drying device for drying electrode substrates that have undergone primary and secondary spraying.

9. A novel lithium battery electrode sheet top-coating double-sided coating device according to any one of claims 1, characterized in that: It also includes a fifth guide roller, a second pressure roller, a traction roller, and a sixth guide roller, which are used to change the conveying direction of the dried electrode substrate. It also includes take-up rolls, used for taking up electrode substrates that have been dried and whose conveying direction has been changed.

10. A novel lithium battery electrode top-coating double-sided coating device according to any one of claims 1, characterized in that: The fifth roller and the second pressure roller are located on the reverse side of the electrode substrate. The traction roller and the sixth through roller are located on the front side of the electrode substrate. The second pressure roller and the traction roller abut against each other to flatten the dried electrode substrate.

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